I have 2 Henry 2K Classic amplifiers and in both of them the tube
filaments are most certainly in parallel. A Dark tube, noted on both,
was caused by slight loosening of the filament grips in the sockets. The
tremendous heat cycling coupled with the need for very low R at this
point makes it a clear weak spot I think.
Martin, HS0ZED
On 30/06/2019 02:53, Ted Rachwal wrote:
Thanks to all who offered advice on fixing the loss of filament to one
of the 3-500Z tubes in the Henry 2K amp.
I put the tubes back in and started to check filament voltage 1st and
when I stuck the probe into pin #1 on V1, the tube came on. Pulled the
tubes again and cleaned all the pin holes and clamps then I gently
squeezed the clamps a little to tighten them some. Put the tubes back
in and we are working back at full output.
Thanks for all the advice, I have learned quite a bit in last couple
days by going thru the schematics looking for different circuits in
the amp, you were all a great help!
73,
Ted K8AQM
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